The ciliary muscle of the eye is relaxed under which condition?
A)eye is focused on a distant object
B)eye is focused on a nearby object
C)subject being viewed is well illuminated
D)subject being viewed is dimly illuminated

Question

Quizplus · Accepted Answer

The ciliary muscle of the eye is relaxed when the eye is focused on a distant object because it allows the lens to become flatter and thinner, which is necessary to focus on faraway objects. When the ciliary muscle is contracted, the lens becomes thicker and rounder, which is necessary to focus on nearby objects. Thus, when the eye is focused on a nearby object, the ciliary muscle is contracted. The illumination of the subject being viewed has no direct effect on the ciliary muscle.

The Ciliary Muscle of the Eye Is Relaxed Under Which